I think what people are suggesting is to capture all your current fish in your tank and put them in to a QT tank with the newcomers. then leave the main display tank completely fishless for 10 weeks and treat the QT with hyposalinity for that same time period.
If you don't have corals or many inverts I might suggest gathering up any inverts or corals and putting them into another smaller tank and treating your DT with hyposalinity for 2 months...otherwise you going to need a big QT tank with that many fish.
for the other question, use cupramine for treatment if you are going to use copper and make sure you test and retest...follow the directions as they as put forth by seachem..or the copper will kill your fish as quickly as the ich.
make sure you buy a chemical test kit.
copper will not destroy the biological filtre...however, any inverts in your tank will die off which could cause an ammonia spike...and if you test for ammonia, the copper in the system will cause a slight reading of ammonia.
I personally would suggest hyposalinity of around .10 for 2 months if you know it is only ich and not marine velvet.
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Way too much time and money has gone into this hobby....and yet, I CAN'T STOP
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